On Fri, Nov 13, 2015 at 10:43:11AM +0100, Arnd Bergmann wrote:
> On Friday 13 November 2015 10:33:50 Mason wrote:
> > Hello,
> >
> > I'm wondering how much C preprocessor syntax one can use in DT files.
> >
> > Suppose I have 2 board DTS (both including common.dtsi)
> >
> > board_A.dts (1-core), board_B.dts (2-core)
> >
> > Can I have in common.dtsi something along these lines:
> >
> > cpus {
> > enable-method = "foo,bar";
> > #address-cells = <1>;
> > #size-cells = <0>;
> >
> > cpu0: cpu@0 {
> > compatible = "arm,cortex-a9";
> > device_type = "cpu";
> > reg = <0>;
> > };
> >
> > #if CORE_COUNT > 1
> > cpu1: cpu@1 {
> > compatible = "arm,cortex-a9";
> > device_type = "cpu";
> > reg = <1>;
> > };
> > #endif
> > };
> >
> >
> > board_A.dts would have
> > #define CORE_COUNT 1
> > #include "common.dtsi"
> >
> > board_B.dts would have
> > #define CORE_COUNT 2
> > #include "common.dtsi"
>
> I would prefer not using any preprocessor statements other than
> #include in .dts files.
I very much agree with this.
We should only have (simple) macros for symbolic names, and #includes
required for those to work.
Thanks,
Mark.
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